Carl knopf



Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE. i

CARL ,KNoPF, or HAMBURG, GERMANY.

PROCESS FOR THE PRODUCTION OF WATERPROOF TEXTILE MATERIAL, PAYER, AND

THE LIKE.

No Drawing;- Application filed April 24,1925, Serial No. 25,709, and in Germany December 23, 1924.

arising from deterioration or destruction 01 the cellular tissues of the material, retrogression of the parchmentizing process during lixiviation of the salt solutions employed, and the diiiiculty of regaining the salt solutions for repeated use.

'According to the present invention these disadvantages are overcome, or reduced to such an extent as to ensure commercial success by proceeding as follows: The material to be treated passes, in the course of the continuous operation around heating drums or cylinders previously to reaching the chemical bath necessary for the a .iyloid formation. After being thoroughly impregnated in the chemical bath and after being scraped and squeezed for removing the superfluous chemicals, the material passes around another heating drum or cylinder and while adhering to the surface thereof ri 'icning or maturing process for the amyloid formation. Thereupon the material in order to prevent the retrogression or deterioration of the amyloid formed, passes around a cooling drum or cylinder previously to reaching the lixiviating baths. After beingl iiitlVlttiEt'l in successive stages of the continuous operation, the material is caused to pass, in a zig-zag course, through washing baths and over stands provided with spraying tubes. Finally, after being treated in an impregnating bath for colouring and like purposes if required, the material is submitted to a gradual drying process by being p2 around a series of drying drums or crs.

ihe passage of the material to be treated, previously to entering the chemical bath, over heating or drying cylinders produces the essential advantages, that the concentration of the chemical bath is kept constant and that the amyloid formation, which is accelerated by an addition of an oxidizing undergoes the agent or oxidizing agents, is not affected by reason of any weakening of the chemical bath.

After the saturated material has been scraped at both sides and squeezed so as'to remove the superfluous chemicals, the heating drum or cylinder effects a quick maceration and binding together of the fibrous particles of the saturated material, by transforming a part of them into soluble amyloid, which is rendered insoluble by the action of the cooling drum or cylinder and by the gradual lixiviating, washing and drying process, and envelope and cements together.

the untransformed fibrous particles.

The improved process may be carried outby apparatus of known kind arranged to elfect the respective stages of the complete operation continuously and successively in the desired sequence; a detailed description of any particular form of apparatus is therefore deemed to be unnecessary. It may be mentioned, however, that in the preferred arrangement the apparatus is adapted to deal with the material in the form of webs and comprises the following elements, viz: Heating drums or cylinders around which the web material passes from the web rolls; a chemical bath and guide rollers leading the web thercthrough from the heating drums; scrapers adapted to act on both sides of the material as it leaves the chemical bath;squeezing rollers acting on the web after it has been scraped; a heating drum or cylinder and a roller adapted to press the web against said heating cylinder; a cooling drum; a plurality of lixiviating baths and squeezing rollers acting on the web as it leaves each bath; a plurality of washing baths and sets of spraying tubes adapted to spray both sides of the web, and squeezing rollers acting on the web after it has passed each Washing bath, and a series of heating drums for finally drying the web.

The improved process and the arrangement of the plant as described have proved a complete success in practical use. The ciliciency will be apparent, without further eX- planation, from the statement that webs of 15 to 1,000 grammes weight per square metre can be successfully treated by the process according to the invention, whereas with the hitherto customary methods Webs below and above 250 grammes weight per square metre were excluded from being successfully treated.

It will iJC understood that the urranr'en'lent of apparatus outlined above, for dealing); with material in web form, is referred to merely in; am example, and that it desired the appli 'ntion of the process to material in sheet Form may be readily arr: iged tiior hy providii'lg suitable devices Such as endless bands, for guiding the sheets throughout the upl'mrutus.

lVhut I do claim as my invention and desire to secure by Letters Patent is:-

Process of purchmentizing pope: and like 15 material by a continuous operation, comprising the following successive procedures, the mziterizll. to he mrchmentized is airtificiully dried, immediately tl'ierezifter it is treated in a bath containing mnyloid-forining salts, urliter leaving the chemical bath is scraped at both sides, squeezed between pressure rollers and heated to mature the :nnyloid formed by the chemical treatment, subsequently it is cooled su'liiciently to prevent retrogression or deterioration of the nun-loid formed, and finally it is lixivieted,

wished and dried.

In Witness whereof I have hereunto signed my nznne this 31st d 21y of Wurcln 1925.

CARL KNOPF. 

